Correct Answer - Option 3 : INTEGRATION
Words that can/can't be formed by using the letters of the word QUESTIONNAIRE are:
1) NEST → QUESTIONNAIRE → Can be formed
2) QUOTE → QUESTIONNAIRE → Can be formed
3) INTEGRATION → QUESTIONNAIRE → Can't be formed as G and one more T is required.
4) QUIET → QUESTIONNAIRE → Can be formed
Hence, ‘INTEGRATION’ is the correct answer.